Sulfuric acid resistance of blended ash geopolymer concrete

Sulfuric acid resistance of blended ash geopolymer concrete

► Geopolymer concrete prepared with blended ash (PFA+POFA), activated by alkaline solution and 1.5year 2% H2SO4 exposure. ► The evaluation of acid resistance in terms of visual appearance, mass change and compressive strength was examined. ► The effect of H2SO4 investigated by XRD, FTIR, TGA/DTG, SE...

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Bibliographic Details
Published in:Construction & building materials Vol. 43; pp. 80 - 86
Main Authors: Ariffin, M.A.M., Bhutta, M.A.R., Hussin, M.W., Mohd Tahir, M., Aziah, Nor
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-06-2013
Elsevier B.V
Subjects:
Alkaline solution
Analysis
Blended ash
Compressive strength
Fly ash
Geopolymer concrete
Materials
Microstructure
Portland cement
Properties
Sulfuric acid
Malaysia
Alkaline solution
Blended ash
Compressive strength
Microstructure
Geopolymer concrete
Sulfuric acid
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Summary:► Geopolymer concrete prepared with blended ash (PFA+POFA), activated by alkaline solution and 1.5year 2% H2SO4 exposure. ► The evaluation of acid resistance in terms of visual appearance, mass change and compressive strength was examined. ► The effect of H2SO4 investigated by XRD, FTIR, TGA/DTG, SEM. ► H2SO4 exposed geopolymer concrete was superior to OPC, due to more stable cross-linked aluminosilicate polymer structure. This study presents an investigation into the durability of geopolymer concrete prepared using blended ash of pulverized fuel ash (PFA) and palm oil fuel ash (POFA) along with alkaline activators when exposed to 2% solution of sulfuric acid for up to 18months. Ordinary Portland Cement (OPC) concrete was also prepared as control concrete. The main parameters studied were the evaluation of mass, compressive strength, products of degradation and microstructural changes. The deterioration was examined using X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetry (TGA/DTG), scanning electron microscopy (SEM). The results of geopolymer and OPC concretes were compared and discussed. The performance of geopolymer concrete when exposed to 2% sulfuric acid solution for more than a year was superior to OPC concrete which is attributed to a more stable cross-linked aluminosilicate polymer structure formed in the geopolymer concrete.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2013.01.018